Acer barbinerve - UWBG Washington Park Arboretum, Seattle; accession 1952. Photographs: the first two late November 2005; the last two mid-April 2006.
The leaves of my barbinerve are not quite exactly as those of the arboretum but there is a lot of variability in the species and they are probably both barbinerve. Pictures taken beginning of April 2006. Gomero